Coolant pipe

Hey guys,
Just wondering if the long metal coolant pipe that goes around the back of the block and into the water pump is meant to have a gasket or o ring where it pushes into the water pump? Or if not how is the best way to stop leaking?
Just wondering if the long metal coolant pipe that goes around the back of the block and into the water pump is meant to have a gasket or o ring where it pushes into the water pump? Or if not how is the best way to stop leaking?